23 grams of sodium reacts with 293 cm 3 if water that is initially at 298 K. It produces an enthalpy change of 197 kj. What is the final temperature of the water? The specific heat capacity of water is 4.18 j/k g.

What is an example of a physical property?

Which compound contain an iron with a 3+ charge

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)